前から好きだったけど、ライブに行ってもっと好きになったって英語でなんて言うの？

Hi, Shiori!

"live" = the "i" is pronounced like the "i" in "dive"
To see a performance "live" means to attend a live performance.

Using the expression "even more" shows that you liked the band already. So it's optional to mention that you liked the band before seeing their concert.

If you prefer to mention it anyway, you can say "I was already a fan, but after seeing them live, I like this band even more!"

Therefore, I think a phrase you can use is "After seeing them live, I like this band even more!"

I hope this helps! Good luck! ✰✰

1. This distinguishes the difference between 'Like' and 'Love'.
2. This shows the distinction between 'Good' and 'Great'.
3. This expression uses a traditional one to ten scoring system to express this point

>I am so much more in love with this band after seeing their concert.
>I never thought that would love the band so much more after the live show.
This explains that you like them more after the live concert.

Other sentences
a. The live show just made me like them so much more.
b. I am so happy I went to the live show because now I like them so much more.

Sometimes playing "live"....sorts out "the wheat frrom the chaff"/"the strong from the merely fit..."/"The Men from the Boys!"
"I was into them before...but after seeing them live...I was totally hooked!"

These are both simple ways of explaining this question.
You can use the word "live" or "at a concert". Both mean that you watched them in person.

I hope this helps :)

You may always have loved a particular band's music, and liked their videos before watching them perform live in concert. Watching a band perform live in concert can mesmerize you and completely fascinate you. This can make you love the band even more. This can make you boast about what has now become your favorite band.
So, you may say:
I have always loved this band's music, but I love them even more now after seeing them live in concert.